JP2000011521A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform reproductions in which a sound break is not generated as to more many or musics by storing more numerous introductory part data with a limited memory capacity in a disk changer system. SOLUTION: Whilst a selected MD(mini disk) is to be chucked on a spindle motor, an optical pickup is made to be moved to an object position where a selected music is recorded in the radial direction of an optical disk by a thread motor. Or, introductory part data Da1 to Df1 are made to be stored in a DRAW 50 by changing data quantities of the introductory parts data Da1 to Df1 of musics of 1st to 6th MDs according to the maximum time needed for one series of operations for a disk change. When the music of a second MD is selected, at first, this player reads out the introductory part data Db1 of the music of the second MD stored in the DRAM 50 to output the data. At the same time, the player writes data posterior to the introductory part data of the music of the second MD in the DRAM 50 by performing the disk change to the second MD.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can store a plurality of disks such as an MD (mini disk) and a CD (compact disk) on which information data such as a plurality of music data are recorded. The present invention relates to a disc reproducing apparatus such as an MD changer system or a CD changer system that can select and reproduce arbitrary information data recorded on a disc.

[0002]

2. Description of the Related Art A disc player such as an MD player or a CD player can select and play an arbitrary song from a disk on which a plurality of songs are recorded.
Furthermore, a disc changer such as an MD changer system or a CD changer system capable of storing a plurality of discs such as MDs and CDs, and selecting and reproducing an arbitrary music recorded on an arbitrary disc from the plurality of discs. Systems are also being considered.

[0003]

However, in the above-described disc player, when the user selects a certain song, the track of that song on the disc is selected and the song is actually reproduced before the song is reproduced. It takes a certain amount of time, during which the user has to wait for the song to be played, and when trying to listen to another song while listening to one song, the sound is interrupted during that time Would.

[0004] In particular, in the above-described disc changer system, it takes a long time of about 10 seconds from the completion of the exchange of the disc to the reproduction of the target music from the selected disc. As we continue,
Give the user discomfort.

Therefore, in such a disc changer system, when a user selects a certain song recorded on a certain disc, the song is immediately introduced from the introduction portion of the song, that is, from the so-called intro portion of the beginning of the song. Is reproduced so that the sound is not interrupted. Japanese Patent Application No. 10-145705 (May 1998
(Filed on March 27).

In the invention of the prior application, a DRAM
The data of the introduction part of the music recorded on the disc is stored in a memory such as a memory, and when the music is reproduced, first, the introduction part data is read out from this memory and output, and subsequently, the disc is read out. Then, the data after the introduction section data of the music data reproduced from is output.

Therefore, according to the invention of the prior application, at the time of music reproduction, the music is immediately reproduced from the introduction section of the music, and the exchange of the disk is completed, and the selected music is reproduced from the selected disk. Until the introductory data read from the memory, the introductory part of the song is played,
Sound is not interrupted.

[0008] However, the invention of the prior application can be applied to a case where information recorded on a disc and reproduced from the disc is not a song but an image or other information. The present invention can also be applied to a changer system using a recording medium other than a disc and an information reproducing apparatus other than the changer system.

However, in the disc changer system, for example, when a user listens to a song recorded on a fourth disc and tries to listen to a song recorded on a second disc, After returning the fourth disk to its original position, the disk changer system pulls out the second disk from its original position onto the mechanical deck base, chucks it to the spindle motor, and further seeks the beam on the disk. A series of operations, such as moving the spot in the radial direction of the disc to the target position where the selected music is recorded, must be performed. If not according to the invention of the prior application, this series of operations is completed. The sound is interrupted for about 10 seconds.

[0010] Therefore, in the invention of the prior application, the introductory portion data of a data amount that takes about 10 seconds or more per song when reproduced is stored in the memory. For this reason, in order to store the introductory data in the memory for all the songs recorded on all the discs and realize playback without sound interruption, a large-capacity memory is required. On the other hand, the cost of the system is increased, and conversely, if a memory having a limited capacity is used, the introduction section data can be stored in the memory, and the number of music pieces that can be reproduced without interruption of sound is limited.

Accordingly, the present invention is capable of storing a larger number of introduction data with a limited memory capacity and realizing reproduction of a larger number of information without causing any interruption of information. It is.

[0012]

According to the first aspect of the present invention, a plurality of discs each storing a plurality of information data can be stored, and any information data recorded on any disc can be stored from the plurality of discs. In the disc reproducing apparatus for selecting and reproducing, the pickup is moved in the disc radial direction to the target position where the selected information data is recorded until the selected disc is mounted on the disc rotation driving unit. A pickup thread control unit, a memory for storing the introduction data of the information data, and, at the time of reproducing the information in which the introduction data is stored in the memory, first reading the introduction data from the memory. A data output control unit for outputting data after the introduction data of the information data reproduced from the disc; The provision.

In the second invention, a plurality of discs each storing a plurality of information data can be stored, and a disc for selecting and reproducing arbitrary information data recorded on an arbitrary disc from the plurality of discs can be stored. In the reproducing apparatus, a memory in which the introduction data of the information data is stored, and the introduction data having a different data amount depending on the place where the disc on which the information data including the information data is stored are stored, At the time of reproducing the information in which the introductory part data is stored in the memory and the data write control part to be stored in the memory, the introductory part data is first read out from the memory and output, and subsequently reproduced from the disc. And a data output control unit that outputs data after the introduction unit data of the input information data.

In the disk reproducing apparatus according to the first aspect of the present invention, the pickup is controlled in advance by thread control after the selection operation by the user and before the selected disk is mounted on the disk rotation drive unit. Since the selected information data is moved in the radial direction to the target position where the selected information data is recorded, the search for the target position by the seek operation after the selected disk is mounted on the disk rotation drive unit is performed in a short time. Thus, the time required for a series of operations for disc change can be reduced.

Therefore, it is possible to reduce the data amount of one piece of information, for example, the introductory data required per song, to store more introductory data with a limited memory capacity, and to store more introductory data. Reproduction without interruption of information can be realized.

The time required for a series of operations for a disk change is not necessarily the same for all disks. For example, when the disk housed in the outermost part of the disk housing is selected, it takes a relatively long time. In many cases, the time varies depending on the location where the selected disk is stored, such as a relatively short time when the disk stored inside the disk storage unit is selected.

In the disk reproducing apparatus according to the second aspect of the present invention, attention is paid to this point, and introductory data having a different data amount is stored in the memory according to the place where the disk is stored. In addition, the minimum introduction part data can be stored in the memory. With a limited memory capacity, more introduction part data can be stored, and reproduction without interruption of information can be realized for more information.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described for the case where the present invention is applied to an MD changer system.

FIG. 1 shows a functional configuration of the MD changer system of this embodiment. The MD changer system is roughly composed of a disk block 10 and a changer mechanical block 90.

The disk block 10 includes an optical pickup 21, an objective lens 22, a two-axis actuator 23, a thread motor 24, a servo driver 25, a spindle motor 26, a spindle driver 27, an RF matrix amplifier 30, a processor 40, a DRAM 50, and a D / A. It includes a converter 60, a mechanical controller 70, an operation unit 80, and the like.

However, a servo processor section 41 of the processor 40, an EFM (eight to fourteen modulation) decoder section 42, an error correction decoder section 43, a memory control section 44, and an ATRAC (adaptive transform) section.
acoustic coding) The decoder unit 45 includes the processor 40
Are merely separated, and the processor 40 is not necessarily physically separated into these units. Also, the processor 40 is functionally equivalent to the MD1
ATRAC encoder for recording data to
Although it also has an FM encoder section, it is not shown in the drawing because it has no direct relation to the present invention.

The laser light emitted from the semiconductor laser in the optical pickup 21 is condensed by the objective lens 22 and irradiated on the MD 1 as a beam spot. M
The reflected light from D1 is detected by the photodetector in the optical pickup 21 via the objective lens 22, and the detection signal is supplied to the RF matrix amplifier 30, and
1, information on the position and size of the beam spot on the MD
1 and data on MD1 are obtained.

The position and size of the beam spot are determined by moving the objective lens 22 in the radial direction of
A large radial movement of the optical pickup 21 and the objective lens 22 in the MD1 direction of the optical pickup 21 and the objective lens 22, which cannot be performed by the two-axis actuator 23, is performed by the thread motor 24.

Therefore, information on the position and size of the beam spot obtained from the RF matrix amplifier 30 is processed by the servo processor 41 of the processor 40, and the servo control signal is sent from the servo processor 41 to the servo driver 25. The two-axis actuator 23 and the sled motor 24 are driven by the servo driver 25 so that the beam spot on the MD 1 has a predetermined position and size.

The RF matrix amplifier 30 obtains
The address information of MD1 is also processed by the servo processor 41, and a servo control signal is supplied from the servo processor 41 to the spindle driver 27,
The spindle motor 26 is driven by the spindle driver 27 so that the MD 1 rotates at a predetermined rotation speed.

The RF matrix amplifier 30 obtains
The data on the MD 1 is EFM-demodulated by the EFM decoder unit 42 of the processor 40, error-corrected by the error correction decoder unit 43, and written into the DRAM 50 by the memory control unit 44. DR
The data written to the AM 50 has been compressed by ATRAC.

The data written in the DRAM 50 is read from the DRAM 50 by the memory control unit 44 at a predetermined timing, and is read out from the ATRAC decoder unit 4.
5, is expanded into audio (song) data by the D / A converter 60, and further converted into analog audio (song) by the D / A converter 60
The signal is converted into a signal and supplied to a speaker or an earphone through an audio amplifier not shown in the figure.

The changer mechanism block 90 moves a specific one of a plurality of MDs housed in the MD changer system to a predetermined position of the disk block 10 as shown in FIG. 1 shows a schematic configuration of an MD changer system capable of storing an MD. FIG. 1A is a diagram viewed from the top, and FIG. 2B is a diagram viewed from the front.

The disc block 10 is fixed to a mechanical deck base 91, and the mechanical deck base 91 can be moved up and down along an elevator guide 92. Then, as shown in FIG. 1, the elevator motor 94 is driven by the motor driver 93 in response to a mechanical control signal from the mechanical controller 70, so that the mechanical deck base 91 and the disk block 10 move up and down.

On the side of the mechanical deck base 91, six MDs 1a to 1f are stored. Then, with the mechanical deck base 91 and the disk block 10 moved to the vertical position corresponding to a certain MD, the loading motor 95 is driven by the motor driver 93 by the mechanical control signal from the mechanical controller 70 as shown in FIG. By being driven, the MD moves above the mechanical deck base 91 and the disk block 10.

This situation is further shown in FIG. The figure shows the case where the second MD1b is selected to reproduce a music. First, the elevator motor 94 is driven to move the mechanical deck base to the position indicated by the broken line as shown in FIG. 91 and the disk block 10
Move to the position indicated by the solid line corresponding to MD1b.

Next, when the loading motor 95 is driven, the MD 1b located at the position indicated by the broken line moves to the position indicated by the solid line above the mechanical deck base 91 and the disk block 10, as shown in FIG. I do.

Next, when the elevator motor 94 is driven, the mechanical deck base 91 and the disk block 10 at the positions indicated by the broken lines (the positions shown in FIG. After moving to the position indicated by the solid line slightly above, the MD 1 b is chucked by the spindle motor 26.

To return the MD 1b to the original position, the operation reverse to the above is performed. The same applies to the case where another MD is selected to reproduce a song or to return another MD to its original position.

Addresses are assigned to the DRAM 50 in FIG. 1, and the input address and output address of the DRAM 50 can be set separately. Then, for example, as shown in FIG. 4, the compressed data from the MD is stored in the DRAM 50,
Addresses are written in order from address 00000, and address 00
When data is stored up to 010, the address 0000
The compressed data is read in order from 0, and the read compressed data is decompressed by the ATRAC decoder unit 45, whereby the desired music is continuously reproduced.

However, conventionally, after the music selection operation by the user, the sound is interrupted until the music selected from the selected MD is reproduced. That is, in the MD changer system shown in FIGS. 2 and 3, for example, when the user is listening to a song recorded on the fourth MD1d, let's listen to a song recorded on the second MD1b. , And the MD changer system is the fourth MD1
After returning d to the original position, the second MD 1b is pulled out from the original position onto the mechanical deck base 91 and chucked to the spindle motor 26 of the disk block 10,
Further, a series of operations of moving the beam spot on the MD 1b in the radial direction of the disc to the target position where the selected music piece is recorded by a seek operation must be performed. Until this series of operations is completed, The sound is interrupted for a while.

On the other hand, in one embodiment of the present invention, the data of the introduction part of the music recorded in the MD, ie, the so-called intro part of the head of the music, is stored in the DRAM 50 in advance by a method described later. Keep it.

For example, as shown in FIG.
For example, in the MD changer system in which the first MD 1a is stored from the middle address of the DRAM 50 to the last address as shown in FIG.
Introductory data Da1, second MD1b of the first song
, The introduction data Db1 of the first tune,..., The sixth MD1
Introductory part data Dfn of the n-th song of f,
Introductory data of the first to n-th music pieces of all the stored MDs 1a to 1f is stored.

The introductory data stored is AT
Assume that the data has been compressed by RAC. The data amount of each introduction part data is equal to or longer than the time required for a series of operations for disc change when the introduction part data is read from the DRAM 50 and expanded by the ATRAC decoder unit 45 as described later. Shall be.

When the user performs a music selection operation on the operation unit 80, the processor 40 first determines whether or not the introduction part data of the music selected by the user is stored in the DRAM 50, and the data is not stored. Sometimes, the MD is exchanged by the mechanical controller 70 and the selected M
By selecting the song selected by the user from D and writing the compressed data including the introduction data of the song to the DRAM 50, reading it out from the DRAM 50, and decompressing it by the ATRAC decoder unit 45, as described above with reference to FIG. , And play the song continuously from the introduction section.

On the other hand, when the introduction data of the music selected by the user is stored in the DRAM 50, the processor 40 stores the introduction data in the DRAM 5
0, decompressed by the ATRAC decoder unit 45, reproduces the introduction of the music, exchanges the MD by the mechanical controller 70, and selects the selected MD.
The user selects a song selected by the user, and writes the compressed data after the introduction part data of the song to the DRAM 50,
Following the reading of the introductory data from the DRAM 50, the data is read from the DRAM 50 and the ATRAC decoder 4
5, the music portion after the introduction of the music is continuously reproduced for the introduction.

For example, as shown in FIG.
When the user selects the first music piece of the second MD 1b when the introduction data of the music pieces from the first music piece to the n-th music piece of the six MDs 1a to 1f are stored in 0, it is shown in FIG. First, as shown in FIG.
The introductory data Db1 of the first song of the MD1b is
From the beginning to the end, the data is read out by the memory control unit 44, decompressed by the ATRAC decoder unit 45, and the introduction part of the first music piece of the second MD 1b is reproduced.

At the same time, in the MD changer system, the MD from which the user has been listening to the music is returned to the original position, and the second MD 1b is pulled out from the original position onto the mechanical deck base 91. Is chucked by the spindle motor 26, and the first song of the second MD1b is selected by the seek operation.
As shown in FIG. 5, the compressed data after the introductory data Db1 of the song is
The data is written to the RAM 50 in order from the address 000000.

When the introductory part data Db1 stored in advance in the DRAM 50 is read to the end, the output address of the DRAM 50 is set to the address 000000, and the first tune from the second MD1b is read. The compressed data after the introduction part data Db1 is
It is read from 0 and decompressed by the ATRAC decoder unit 45.

Therefore, at the time of reproduction of the music in which the introduction part data is stored in the DRAM 50, the music is immediately reproduced from the introduction part of the music so that the sound is not interrupted and continuous with the introduction part. The music part after the introduction is reproduced.

[First Example] In order to realize reproduction without interruption of sound as described above, introduction part data stored in the DRAM 50 is read from the DRAM 50 and read out from the ATRAC decoder 45 as described above. When decompressed, the data amount needs to be longer than the time required for a series of operations for disc change.

Therefore, in the first example of the present invention, the time required for a series of operations for disc change is reduced, the data amount of the introductory data required per song is reduced, and the DRAM 50 is limited. With the increased memory capacity, the introductory data of a larger number of songs can be stored.

In the MD changer system shown in FIGS. 2 and 3, for example, when the user
If the user tries to listen to the first song of the second MD 1b while listening to a certain song, the MD changer system returns the fourth MD 1d to the original position as described above. Then, the second MD 1b is pulled out from the original position onto the mechanical deck base 91 and chucked to the spindle motor 26 of the disk block 10.

However, at this time, the optical pickup 21
The beam spot on the second MD 1b is not necessarily located at the target position 2o where the first song of the second MD 1b is recorded, as shown by the bold line in FIG. At the time when the MD 1b is chucked by the spindle motor 26, the initial position 2i as shown by the thin line in the figure, that is, the radial position of the disk on which the music of the fourth MD 1d that was listened immediately before is recorded, or It is at a predetermined home position.

Therefore, conventionally, as described above, the MD
After chucking 1b to the spindle motor 26, the beam spot on the MD 1b is further moved by a seek operation in the radial direction of the disc from the initial position 2i to the selected song.
In the above case, the target position 2 where the first song is recorded
Move to o. However, the movement of the beam spot to the target position 2o by this seek operation takes a considerable time, and occupies a considerable part of the time required for a series of operations for disc change.

Then, since the target position 2o can be known in advance, in the first example of the present invention, after the music selection operation by the user, the selected MD is transferred to the spindle motor 2o.
The optical pickup 21 is moved to the target position 2o in the disk radial direction by the thread motor 24 shown in FIG.

More specifically, for example, after the music selection operation by the user, the MD that has been reproduced up to that point is moved in parallel with returning to the original position. The movement of the optical pickup 21 to the target position 2o by the thread motor 24 can be performed in a short time by a method described later.

Alternatively, the selected MD is pulled out from the original position onto the mechanical deck base 91 and chucked by the spindle motor 26, and at the same time, the optical pickup 21 is moved to the target position 2o in the disk radial direction by the thread motor 24. It can also be moved, in which case no special time is required for the movement.

Further, as described above, the optical pickup 21 is previously moved to the target position 2 by the thread motor 24.
Since it is moved to o, the search for the target position 2o by the seek operation after the selected MD is chucked by the spindle motor 26 can be performed in a short time.
Therefore, the time required for a series of operations for disc change can be reduced.

In the MD, information such as the title, time, and recorded address of each song recorded on the MD is recorded as TOC (Table of Contents) information. The MD changer system reads the TOC information from the MD stored therein in advance and stores it in the DRAM 50 as shown in FIG.

After the music selection operation by the user, the processor 40 shown in FIG. 1 uses the TOC information written in the DRAM 50 to select the selected music, for example, 2
The moving amount or moving time of the optical pickup 21 is determined by the following method by checking from which address on the disc the first song of the first MD1b is recorded, and the determined moving amount is determined. Alternatively, the servo processor unit 41 moves the optical pickup 21 in the disk radial direction by the thread motor 24 for the moving time.
And sends a servo control signal to the servo driver 25 via the.

When the thread motor 24 has a means capable of detecting the position of the optical pickup 21 in the disk radial direction, such as a linear motor, a certain address and the disk radial position of the optical pickup 21 at that address are determined. The correspondence is checked in advance for each address, and the initial position 2i is obtained from the correspondence.
And the movement amount according to the address of the target position 2o can be determined.

If there is no means capable of detecting the position of the optical pickup 21 in the disk radial direction, it is necessary to move the optical pickup 21 from a certain reference position to a certain address by the thread motor 24 as described below. The correspondence between the required time and the address may be checked in advance for each address.

FIG. 7A shows a case where the optical pickup 21 is located at the innermost periphery of the MD. For example, the innermost periphery detection switch 97 is provided on the mechanical deck base 91 with the position at this time as a reference position. Provided, optical pickup 2
When 1 is at the reference position, the innermost circumference detection switch 97 is turned on. Then, the optical pickup 21 is kicked by the thread motor 24, and the time required for the optical pickup 21 to move from the reference position P0 to the position P1 at a certain address shown in FIG. 7B is measured.

This measurement is performed for each address.
By doing so, it is possible to check the correspondence between the time required to move the optical pickup 21 from the reference position to the position of a certain address by the thread motor 24 and the address in advance for each address. The moving time corresponding to the address of the initial position 2i and the address of the target position 2o can be determined from the correspondence.

Alternatively, if the optical pickup 21 has means for detecting the position of the optical pickup 21 in the disk radial direction,
When writing the introduction part data to the DRAM 50, the position of the optical pickup 21 in the disk radial direction at the address where the introduction part data is recorded on the MD is detected, and the correspondence with the address is written to the DRAM 50 or the like. It may be.

According to the above-described first example, the time required for a series of operations for disc change can be reduced, and the amount of introductory data required per song can be reduced. With a limited memory capacity of the DRAM 50, a larger number of introduction section data can be stored, and reproduction of a larger number of music pieces without interruption of sound can be realized.

[Second Example] The time required for a series of operations for disc change is not always the same for all MDs. For example, in the MD changer system shown in FIGS. 2 and 3, as shown in FIG.
The disc is changed from the first MD1a to the sixth MD1f, and as shown in FIG.
In the case where the disc is changed from a to the third MD 1c, in the former case, the time required for a series of operations for disc change becomes longer because the moving time of the mechanical deck base 91 and the disc block 10 is longer. .

Even when the disc is changed to the sixth MD 1f, the time required for a series of operations for the disc change differs depending on which of the first to fifth MDs 1a to 1e changes the disc. Eye MD
The maximum time T1,6max required for a series of operations when changing disks to the 1a or sixth MD1f is the maximum time T2 required for a series of operations when changing disks to the second MD1b or the fifth MD1e. , 5max, which is the maximum time T3 required for a series of operations when a disc is changed to the third MD1c or the fourth MD1d.
4max is shorter than the maximum time T2,5max required for a series of operations when changing disks to the second MD1b or the fifth MD1e. That is, T1,6max>T2,5max> T
3,4max.

Therefore, in the second embodiment of the present invention, as shown in FIG. 9, the first MD1a and the sixth MD1f
As introduction part data Da1 and Df1 for
As the introduction part data Db1 and De1 for the second MD1b and the fifth MD1e, the one with the intermediate data amount AM is used for the third MD1c and the fourth MD1b. The introduction data Dc1 and Dd1 for the MD1d are the minimum data amount AS
Are stored in the DRAM 50, respectively.

According to this, the data amount of the introduction part data for each MD is determined according to the maximum time required for a series of operations for disc change for each MD, so that the DRAM 50 is limited. With a reduced memory capacity, a larger number of introductory data can be stored, and reproduction without interruption of sound can be realized for a larger number of songs.

[Writing of Introductory Section Data] As previously described, in order to store introductory section data in the DRAM 50 in advance, a control program for the
0 is provided. With this, the processor 40 determines when the MD is stored in the MD changer system, when the user designates the MD and the song number on the operation unit 80, and instructs to write the introductory data, or when the respective songs are first recorded. At the time of reproduction or the like, the introduction part data is read from the MD and written into the DRAM 50.

[Other Examples or Embodiments] The first example and the second example described above can be combined. In such a case, even with a limited memory capacity of the DRAM 50, a larger number of introductory data can be stored, and reproduction of a larger number of music pieces without interruption of sound can be realized.

In the above-described embodiment, the disc to be reproduced is an MD.
The present invention can also be applied to a disc changer system for an optical disc such as D or a disc other than the optical disc. The information recorded on the disc and reproduced from the disc is not limited to music, but may be an image or other information.

[0070]

As described above, according to the present invention, when a user selects certain information recorded on a certain disk, the information is immediately reproduced from the introduction part of the information, and the sound is reproduced. In such a case, a large amount of introduction part data can be stored with a limited memory capacity, and the reproduction of a large number of pieces of information without interruption can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a functional configuration of an MD changer system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an MD storage state of the MD changer system according to one embodiment of the present invention.

FIG. 3 is a diagram showing a state of a disk change in the MD changer system of FIG. 2;

FIG. 4 is a diagram showing the configuration and operation of a memory in a conventional MD changer system.

FIG. 5 is a diagram showing an example of the configuration and operation of a memory in the MD changer system according to one embodiment of the present invention.

FIG. 6 is a diagram for explaining a pickup position when a disc is changed in the MD changer system according to the embodiment of the present invention;

FIG. 7 is a diagram for explaining a case where an optical pickup is moved in advance in the MD changer system according to the embodiment of the present invention;

FIG. 8 is a diagram showing that the time required for a series of operations for disc change differs depending on the location where the selected MD is stored.

FIG. 9 is a diagram illustrating an example of a case where introduction part data having a different data amount according to a place where a selected MD is stored is stored in a memory;

[Explanation of symbols]

1, 1a to 1f: MD, 10: disk block, 21
... Optical pickup, 24 ... Thread motor, 26 ... Spindle motor, 40 ... Processor, 44 ... Memory control unit, 50 ... DRAM, 60 ... D / A converter, 70 ... Mechanical controller, 80 ... Operation unit, 90 ... Changer mechanical block , 91… Mecha deck base, 9
2: Elevator guide, 97: Inner circumference detection switch

Claims (3)

[Claims] 1. A disc reproducing apparatus capable of accommodating a plurality of discs each recording a plurality of information data, and selecting and reproducing any information data recorded on any disc from the plurality of discs. A pickup thread control unit for moving the pickup in the radial direction of the disc to a target position where the selected information data is recorded until the selected disc is mounted on the disc rotation drive unit; A memory for storing the introduction part data of the data, and at the time of reproducing the information in which the introduction part data is stored in the memory, first, the introduction part data is read out and output from the memory, and subsequently, A data output control unit for outputting data after the introduction data of the information data reproduced from the Disc playback device. 2. A disc reproducing apparatus capable of accommodating a plurality of discs on each of which a plurality of information data are recorded, and selecting and reproducing any information data recorded on any disc from the plurality of discs. A memory in which the introduction part data of the information data is stored and, as the introduction part data, a data having a different data amount depending on a place where a disk on which the information data including the information data is stored is stored in the memory. A data write control unit, when reproducing the information in which the introductory data is stored in the memory, first read out the introductory data from the memory and output it, and subsequently, the information data reproduced from the disc; And a data output control unit that outputs data after the introduction unit data. 3. The disk reproducing apparatus according to claim 2, wherein the data amount of the introduction part data of the disk stored in the outermost part of the disk storage part is maximized.